Combine preserves, chicken broth, onions, and Dijon and pour over roast in crock pot. Cook on low for 10-12 hrs, or high 5-6. Remove meat, let rest, and slice or shred. I like this served over couscous, so grab yourself a box and make it. Instead of water use the rest of your chicken broth as the cooking liquid (add water to it if necessary to measure as needed per couscous instructions). Drizzle sauce over all.